<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			div {
				width: 200px;
				height: 200px;
				border: 1px solid red;
			}
			div:first-child {
				border-radius: 100px;
			}
			div:nth-child(2) {
				border-radius: 100px;
			}
			div:nth-child(3) {
				border-radius: 50%;
			}
			div:nth-child(4) {
				border-radius: 10px 40px;
			}
			div:nth-child(5) {
				border-radius: 10px 40px 80px;
			}
			div:nth-child(6) {
				border-radius: 10px 40px 80px 100px;
			}
		</style>
	</head>
	<body>
		<div></div>
		<div></div>
		<div></div>
		<div></div>
		<div></div>
		<div></div>
		<div></div>
		<div></div>
		<div></div>
		<div></div>
	</body>
</html>
